Mercury 13.8V 30A Switch Mode PSU - 414W

The Mercury is a 13.8V 30A switch mode power supply delivering up to 414W continuous output across three independent channels. The 13.8V output matches the fully charged voltage of a 12V lead-acid battery, making it compatible with battery-backed CCTV systems, radio communications equipment, access control panels and 12V DC LED installations that expect 13.8V nominal supply.

Designed for professional security and AV installations, the PSU fits inside equipment racks, control cabinets and comms rooms where mains AC is available and multiple 12V DC devices need powering from a single regulated source. The three output channels share the 30A total capacity, allowing installers to distribute load across separate zones or device types without needing individual PSUs. Screw terminal connections on the front panel accept cable from 0.5mm² to 2.5mm² for mains input and DC output wiring.

The enclosure measures 220x50x115mm and weighs 0.85kg, giving it a compact footprint for rack or wall mounting. An integrated fan keeps internal components within operating temperature during sustained high-current draws, and vents on the top panel exhaust warm air upwards. Short-circuit and overload protection shut down the output if fault conditions are detected, with automatic reset when the fault clears. The IP20 rating suits indoor installations in dry environments.

The voltage regulation range of 12.42V-15.18V allows for slight mains fluctuations and load variations without dropping below the minimum 12V threshold that most 12V DC equipment requires. Working temperature range is -10°C to 40°C, covering unheated UK outbuildings in winter and warm summer comms rooms without external cooling.

Product Manual

What's the difference between 13.8V and 12V?

13.8V is the fully charged voltage of a 12V lead-acid battery. Equipment designed for battery backup expects this voltage, so using a 13.8V PSU ensures compatibility with CCTV systems, access control panels and radio equipment that would otherwise see 13.8V when running from a charged battery.

How are the three output channels used?

The three channels share the total 30A capacity. Installers typically use them to separate different device types (cameras on channel 1, access control on channel 2, intercom on channel 3) or to distribute load across zones. Each channel has its own screw terminal pair on the front panel.

Does it need ventilation?

Yes. The integrated fan exhausts warm air through vents on the top panel. Allow at least 50mm clearance above the unit and do not mount it in a sealed enclosure without additional ventilation. The PSU will run hot under sustained high-current loads.

What cable size is needed for the DC output?

At 30A continuous, use 4mm² cable for runs under 5m, 6mm² for runs 5-10m. Voltage drop increases with cable length and thinner wire, which can cause connected equipment to malfunction. The screw terminals accept cable from 0.5mm² to 2.5mm² physically, but that does not mean thin cable is suitable for 30A loads.